1. Constant Filter Filtering operation is carried out at a constant pressure, constant pressure is called filtering. Constant pressure filtration is the most common mode filter, the filtration process, with the thickening of the cake layers, increase resistance to large, due to constant pressure, the filtration rate will gradually decrease. 2. Constant speed filter Filtering at a constant speed, the filter is called a constant speed. With the increase continued, the cake layer thickness of the filter of time, the resistance increases, pressure filtration with the duration of linear growth. Pressure filtration equipment limited capacity, the pressure is not too high. Compressible filter cake, the pressure does not make excessive rise faster, the opposite result was terminated by filtration. 3. After the first constant speed constant pressure filtration This filtering approach is to start at a lower rate constant velocity filter, in order to avoid a premature increase in pressure to form a flow channel blockage, when the pressure rises to a given value after the constant pressure filtration. Quantitative pump, initial filtration while maintaining a constant speed, with sustained pump outlet pressure rise time. If this pressure rises to the setpoint branch makes the valve automatically open, open the branch, part of the return pump inlet filter pulp into the filter press filter pulp reduction filter inlet pressure is maintained constant, thereby starting the constant pressure filtration.
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